In what part of the State does alfalfa grow best without irrigation?
Obviously the parts which have the greatest rainfall in connection with
retentive soil and plenty of summer heat. Alfalfa grows best without
irrigation on "sub-irrigated" land where the ground water is
sufficiently deep to allow a deep rooting of the plant in free soil and
yet not too far down to be readily reached by the deep-running roots.
Good results can be obtained with anywhere from four to ten or twelve
feet of soil above water. On shallower soils the plant is apt to be
short-lived through root troubles. Unirrigated alfalfa is also reduced
by the incursions of gophers which flooding at least once a year will
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